GSAS Fellowship Office – funding for research support, language study, multiple-year general support and dissertation-writing support.

https://gsas.harvard.edu/financial-support/fellowships

Harvard Physics List of External Fellowships

https://sites.google.com/a/g.harvard.edu/physics-graduate-student-advisi...

Financial Resources/Tools for Postdoctoral Scholars

https://research.fas.harvard.edu/resources-postdoctoral-scholars

APS List of Internships and Fellowships 

https://www.aps.org/careers/employment/internships.cfm

Non-APS Scholarships and Fellowships - list of other scholarships, fellowships, and internships for minorities, women, and general students 

https://www.aps.org/programs/education/scholarships.cfm

APS Scholarships and Awards

https://www.aps.org/programs/women/scholarships/

Scholarship Search Engines

Fastweb: https://www.fastweb.com/

Financial Aid: https://finaid.org/scholarships/